SU773520A1

SU773520A1 - Digital phase meter

Info

Publication number: SU773520A1
Application number: SU772484205A
Authority: SU
Inventors: Владимир Васильевич Захаров; Владимир Иванович Евграфов; Юрий Анатольевич Пальчун; Анатолий Иванович Калмыков
Original assignee: Предприятие П/Я В-2518
Priority date: 1977-05-10
Filing date: 1977-05-10
Publication date: 1980-10-23

Description

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Изобретение относитс к цифровой электроизмерительной технике и может быть использовано при разработках высокочастотных цифровых измерителей фазовых сдвигов.5The invention relates to digital electrical measuring technology and can be used in the development of high-frequency digital phase shift meters. 5

Известен цифровой фазометр, содержащий формирователи, триггер, триггер управлени , селектор, формирователь импульсов нониусной последовательности , элемент совпадени , и счет-10 чик импульсов .A digital phase meter is known that contains drivers, a trigger, a control trigger, a selector, a vernier sequence driver, a matching element, and a count of 10 pulses.

Недостатком известного устройства вл етс низкое быстродействие и точность .A disadvantage of the known device is low speed and accuracy.

Известен также цифровой фазометр, содержащий формирователи, триггер, элемент совпадени , счетчик импульсов , генератор квантующих импульсов, делители частоты и блок ФАПЧ pQ.Also known is a digital phase meter containing a driver, a trigger, a coincidence element, a pulse counter, a quantizing pulse generator, a frequency divider, and a pQ PLL.

Данный фазометр вл етс быстро- 20 действующим, однако точность его измерени недостаточно высока .This phase meter is fast-acting, but its accuracy is not high enough.

Цель изобретени - повыиение точности измерений.The purpose of the invention is to improve the measurement accuracy.

Поставленна цель достигаетс тем,25 что в цифровой фазометр, содержащий первый и второй формирователи, выходы которых соединены с входами триггера, подключенного через элемент совпадений к счетчику импульсов, генератор ЗОThe goal is achieved by the fact that 25 in a digital phase meter containing the first and second drivers, the outputs of which are connected to the inputs of a trigger connected through an element of coincidence to a pulse counter, an AO generator

квантующих импульсов, вход которого соединен с выходом блока ФАПЧ, соединенаогчэ первым своим входом с входом второго формировател , а вторым с дополнительным выходом генератора квантующих импульсов и делитель частоты, дополнительно введены дискретна лини задержки, коммутатор и электронный ключ, причем выход генератора квантующих импульсов через последовательно соединенные дискретную линию задержки и электронный ключ присоединен к второму входу элемента совпадений , управл ющий вход электронного ключа через последовательно соединенные коммутатор и делитель частоты подсоединен к выходу второго формировател .quantizing pulses, the input of which is connected to the output of the PLL unit, is connected by its first input to the input of the second driver, and the second with the additional output of the quantizing pulse generator and frequency divider, additionally introduced a discrete delay line, switch and electronic key, and the output of the quantizing pulse generator is sequentially connected discrete delay line and the electronic key is connected to the second input of the coincidence element, the control input of the electronic key in series with unity switch and a frequency divider connected to the output of the second shaper.

На чертеже изображена структурна схема цифрового фазометра.The drawing shows a block diagram of a digital phase meter.

Claims

The digital phase meter contains the first and second drivers 1 and 2, trigger 3, discrete delay line 4, coincidence element 5, pulse counter 6, quantizing pulse generator 7, phase automatic frequency control (PLL) block 8, frequency divider 9, switch 10, electronic key 11. The outputs of drivers 1 and 2 are connected with trigger 3, in addition, the output of driver 2 is connected to the input of frequency divider 9, the output of which is connected to switch 10, and the switch output is connected to control input of electronic key 11. The output of the trigger 3 is connected to the input of the element 5 matches. The output of the generator 7 quantizing pulses through a discrete line 4 delay, electronic keys 11 and the element 5 of the combination are connected to the counter 6 pulses. The voltage under study through the block enters the quantizing pulse generator. Phase meter works as follows. The input sinusoidal voltages and and 112 are fed to the formers 1 and 2 of control pulses of the investigated voltages. From their output, square-wave pulses, the fronts of which are attached to zero transitions of the input signals, arrive at trigger 3, which converts the phase shift to an equivalent time interval. From the output of trigger 3, rectangular pulses whose duration is equivalent to the phase shift of the voltages under study. arrive at the first input of the coincidence element 5, quantizing pulses from the generator 7 via the discrete delay line 4 and the electronic switch 11, controlled by the switch 10, arrive at the second input of the element 5, and from the output of the counter b receives the number of pulses equivalent to the phase shift. The increase in resolution is due to the vernier device containing the frequency divider 9. the switch 10, the discrete delay line 4, the electronic switch 11. The quantization pulses from the oscillator 7 arrive at. the input of the discrete delay line which carries out a time delay relative to the origin in each measurement period of the signal under study by an amount equal to the delay in a single link of the line to Tc / n, where n is the number of links of the line, T, is the quantization frequency period. The delay time of the entire line is equal. Thus, when measuring the phase shift during the n-transitions of the signal under investigation, an additional number of pulses is fed to the counter of 6 pulses via the electronic key 11 and the coincidence element 5. The resolution is equal to Л О / Tv Ч where TX is the duration of impulse 1, equivalent to phase shift. The resolution of the phase meter without the use of a vernier device UD-360, 4 p. Thus, if there is a nonius device - containing a frequency divider 9, a switch 10, a discrete onion 4 delay and an electronic switch 11, the resolution is increased by n times . The unit 8 provides time synchronization and the multiplicity between the generator 7 of quantizing pulses and the voltage under investigation and serves to increase the measurement accuracy and the sample rate in the phase shift units of measurement regardless of the frequency of the voltage under study in a wide frequency range. When using this digital phase meter, a significant increase in resolution and measurement accuracy is achieved, since the phase meter uses the non-zero measurement principle in which the frequency of the quantizing pulse generator can be significantly increased by eliminating the need to form closely spaced additional frequencies on the frequency axis; the design of the instrument is greatly simplified; it is possible to indicate a reference in units of measurement of the phase shift regardless of the frequency of the voltages under study in a wide range of frequencies; the effect of the measurement time on the device performance is significantly reduced. DETAILED DESCRIPTION OF THE INVENTION the second with an additional output of a quantizing pulse generator and a frequency divider, characterized in that, in order to increase the accuracy, it is equipped with a discrete line , switch and electronic key, the output of the quantizing pulse generator through the serially connected discrete delay line and the electronic key connected to the second input of the coincidence element, the control input of the electronic key through the serially connected switch and the frequency divider connected to the output of the second driver. Sources, information taken into account during e-examination 1.Ornatsky P.P. Automatic measurements and devices. Kiev, Vishcha School, 1973, p. 419-420.

2. SmirnovP. T. Digital phase meters. L., Energie, 1974, p. 41-42.